I believe him that it's not about the money, over the last few decades our methods of listening to music have gotten more flexible but also often worse quality. From vinyl to q track to casette then a reprieve with CD followed by degradations with MP3 and minidisk (R.I.P. in piss)

I use it too. So many terrible UI changes. On of the worst is using the 3 bar icon (Trigram for heaven UTF-8 character) for the detailed list view in nautilus and using the exact same icon next to it for the menu!

JavaScript execution speed is not the important thing about WebAssembly. What does matter is that it may open up the development of software for execution inside a browser to a wider variety of languages, almost all of which are likely to be better than JavaScript in one way or another.